Merge from origin/emacs-25

c3489d0 * lisp/w32-fns.el (set-message-beep, w32-get-locale-info) (w3...
a4d882c Correct old cell name unbinding when renaming cell.
6c12c53 Merge branch 'emacs-25' of git.sv.gnu.org:/srv/git/emacs into...
0be6725 Document problem: slow screen refresh on missing font.
853b9b9 * admin/admin.el (add-release-logs): Basic check of existing ...
5fa80cf * build-aux/gitlog-to-emacslog: Handle empty generated Change...
3c79e51 * admin/admin.el (add-release-logs): Generate ChangeLog if ne...
42275df * doc/misc/texinfo.tex: Revert previous change (Bug#23611).
3f4a9d9 * admin/authors.el (authors): First update the ChangeLog.
897fb6f ; 'Changes from the pre-25.1 API' copyedits
825ca25 Rename vc-stay-local back to vc-cvs-stay-local
4efb3e8 * doc/emacs/files.texi (Comparing Files): * doc/emacs/trouble...
b995d1e * doc/misc/eww.texi (Advanced): Fix xref.
2e589c0 Fix cross-references between manuals
f3d2ded * doc/misc/vhdl-mode.texi (Sample Init File): Rename node to ...
906c810 ; * admin/release-process: Move etc/HISTORY from here... ; * ...
bea1b65 * admin/admin.el (add-release-logs): Also update etc/HISTORY.
503e752 ; * CONTRIBUTE: Fix a typo.
fbfd478 Avoid aborting due to errors in arguments of 'set-face-attrib...
bdfbe6d ; * admin/release-process: Copyedits.
44a6aed ; * test/automated/data-tests.el: Standardize license notice.
c33ed39 ; * test/automated/viper-tests.el: Standardize license notice.
df4a14b Add automated test for viper-tests.el
c0139e3 Fix viper undo breakage from undo-boundary changes
920d76c Fix reference to obsolete fn ps-eval-switch
18a9bc1 Do not trash symlinks to init file
2671179 Don't print the "decomposition" line for control chars in wha...
869092c Bring back xterm pasting with middle mouse
5ab0830 Provide workaround for xftfont rendering problem
c9f7ec7 * lisp/desktop.el: Disable restore frameset if in non-graphic...
30989a0 Mention GTK+ problems in etc/PROBLEMS
421e3c4 * lisp/emacs-lisp/package.el (package-refresh-contents):
dadfc30 Revert "epg: Add a way to detect gpg1 executable for tests"
e41a5cb Avoid errors with Czech and Slovak input methods
d4ae6d7 epg: Add a way to detect gpg1 executable for tests
ebc3a94 * lisp/emacs-lisp/package.el: Fix free variable warnings.
6e71295 * lisp/emacs-lisp/package.el (package--with-response-buffer):
c45d9f6 Improve documentation of 'server-name'
3b5e38c Modernize ASLR advice in etc/PROBLEMS
1fe1e0a * lisp/char-fold.el: Rename from character-fold.el.

1 files changed, 18 insertions, 5 deletions

diff --git a/lisp/simple.el b/lisp/simple.el
index 65664c93666..affc403dcdc 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -2848,6 +2848,18 @@ buffers that were changed during the last command.")
 
 If set to non-nil, this will effectively disable the timer.")
 
+(defvar-local undo-auto-disable-boundaries nil
+  "Disable the automatic addition of boundaries.
+
+If set to non-nil, `undo-boundary' will not be called
+automatically in a buffer either at the end of a command, or as a
+result of `undo-auto-current-boundary-timer'.
+
+When this is set to non-nil, it is important to ensure that
+`undo-boundary' is called frequently enough. Failure to do so
+will result in user-visible warnings that the situation is
+probably a bug.")
+
 (defvar undo-auto--this-command-amalgamating nil
   "Non-nil if `this-command' should be amalgamated.
 This variable is set to nil by `undo-auto--boundaries' and is set
@@ -2887,7 +2899,8 @@ REASON describes the reason that the boundary is being added; see
   (dolist (b undo-auto--undoably-changed-buffers)
           (when (buffer-live-p b)
             (with-current-buffer b
-              (undo-auto--ensure-boundary cause))))
+              (unless undo-auto-disable-boundaries
+                (undo-auto--ensure-boundary cause)))))
   (setq undo-auto--undoably-changed-buffers nil))
 
 (defun undo-auto--boundary-timer ()
@@ -2914,10 +2927,10 @@ See also `undo-auto--buffer-undoably-changed'.")
   "Add an `undo-boundary' in appropriate buffers."
   (undo-auto--boundaries
    (let ((amal undo-auto--this-command-amalgamating))
-       (setq undo-auto--this-command-amalgamating nil)
-       (if amal
-           'amalgamate
-         'command))))
+     (setq undo-auto--this-command-amalgamating nil)
+     (if amal
+         'amalgamate
+       'command))))
 
 (defun undo-auto-amalgamate ()
   "Amalgamate undo if necessary.